单例

var mySingleton = {
    property1: "something",
    property2: "something else",
    method1: function () {
        console.log(‘hello world‘);
    }
};

var mySingleton = function () {
    /* 这里声明私有变量和方法 */
    var privateVariable = ‘something private‘;
    function showPrivate() {
        console.log(privateVariable);
    }
    /* 公有变量和方法（可以访问私有变量和方法） */
    return {
        publicMethod: function () {
            showPrivate();
        },
        publicVar: ‘the public can see this!‘
    };
};

var single = mySingleton();
single.publicMethod();  // 输出 ‘something private‘
console.log(single.publicVar); // 输出 ‘the public can see this!‘

var Singleton = (function () {
    var instantiated;
    function init() {
        /*这里定义单例代码*/
        return {
            publicMethod: function () {
                console.log(‘hello world‘);
            },
            publicProperty: ‘test‘
        };
    }

    return {
        getInstance: function () {
            if (!instantiated) {
                instantiated = init();
            }
            return instantiated;
        }
    };
})();

/*调用公有的方法来获取实例:*/
Singleton.getInstance().publicMethod();